WCF::handleException() Unhandled exception: Class 'bts\data\entry\TaggedEntryList' not found

#0 /www/htdocs/w00ddbc3/yourecom/wcf/lib/page/TaggedPage.class.php(130): bts\system\tagging\TaggableEntry->getObjectList(Object(wcf\data\tag\Tag))
#1 /www/htdocs/w00ddbc3/yourecom/wcf/lib/page/MultipleLinkPage.class.php(112): wcf\page\TaggedPage->initObjectList()
#2 /www/htdocs/w00ddbc3/yourecom/wcf/lib/page/TaggedPage.class.php(137): wcf\page\MultipleLinkPage->readData()
#3 /www/htdocs/w00ddbc3/yourecom/wcf/lib/page/AbstractPage.class.php(273): wcf\page\TaggedPage->readData()
#4 /www/htdocs/w00ddbc3/yourecom/wcf/lib/page/AbstractPage.class.php(100): wcf\page\AbstractPage->show()
#5 /www/htdocs/w00ddbc3/yourecom/wcf/lib/system/request/Request.class.php(58): wcf\page\AbstractPage->__run()
#6 /www/htdocs/w00ddbc3/yourecom/wcf/lib/system/request/RequestHandler.class.php(139): wcf\system\request\Request->execute()
#7 /www/htdocs/w00ddbc3/yourecom/wbb/index.php(10): wcf\system\request\RequestHandler->handle('wbb')
#8 {main}